내이의 유모세포의 손상으로 인해 발생하는 감각신경성난청(Sensorineural Hearing Loss, SNHL)의 역동범위는 누가현상(recruitment)으로 인해 정상청각 또는 전음성난청에 비해서 좁은 편이다. SNHL의 좁은 역동범위는 비선형 보청기의 압축비율(Compression Ratio, CR) 그리고 압축역치(Compression Threshold, CT)의 조절을 통하여 개선할 수 있으며, 청력역치(Hearing Threshold Level, HTL)가 증가할수록 50 dB SPL 이하의 낮은 CT와 2:1 이상의 높은 CR을 가진 광역동범위압축(Wide Dynamic Range Compression) 방식의 보청기가 효과적이다.
"Listeners with sensorineural hearing loss (SNHL) have a relatively narrow dynamic range. Due to this reduced dynamic range of hearing, they are recommended to use hearing aids equipped with a special feature called wide dynamic range compression (WDRC). WDRC hearing instruments are configured with high compression ratio (CR) and low compression threshold (CT). However, sound quality can be affected by high CR and low CT in WDRC hearing aids. It is possible to control CT for improving sound quality. In this paper, three cases, including listeners who used ITC (In-The-Canal) type WDRC hearing aids, were reported . Three listeners were satisfied when CT was controlled between 60-70dB SPL. KEY WORDS : Compression Ratio, Compression Threshold, Sound Quality"
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